netdev - [PATCH 1/1] net namespace: dynamically configure new net namespace inherit net config

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Date:	Fri, 26 Jun 2015 17:37:19 +0800
From:	Zhu Yanjun <Yanjun.Zhu@...driver.com>
To:	<netdev@...r.kernel.org>, <davem@...emloft.net>
Subject: [PATCH 1/1] net namespace: dynamically configure new net namespace inherit net config

The new net namespace can inherit from the original net config, or
the current net config. As such, a config is needed to decide where
the new namespace inherit from.

Signed-off-by: Zhu Yanjun <Yanjun.Zhu@...driver.com>
---
 init/Kconfig       |  9 +++++++++
 net/ipv4/devinet.c | 13 +++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/init/Kconfig b/init/Kconfig
index dc24dec..fab8c41 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1212,6 +1212,15 @@ config NET_NS
 	  Allow user space to create what appear to be multiple instances
 	  of the network stack.
 
+config NET_NS_INHERIT_ORIGINAL
+	bool "New network namespace inherits from original net config"
+	depends on NET_NS
+	default n
+	help
+	  Allow new network namespace inherit from original net config.
+	  If no, the new network namespace inherits from the current net
+	  config including the modified net config.
+
 endif # NAMESPACES
 
 config SCHED_AUTOGROUP
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 419d23c..cf635e4 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -2271,6 +2271,7 @@ static __net_init int devinet_init_net(struct net *net)
 #endif
 
 	err = -ENOMEM;
+#ifndef CONFIG_NET_NS_INHERIT_ORIGINAL
 	all = &ipv4_devconf;
 	dflt = &ipv4_devconf_dflt;
 
@@ -2282,6 +2283,15 @@ static __net_init int devinet_init_net(struct net *net)
 		dflt = kmemdup(dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
 		if (!dflt)
 			goto err_alloc_dflt;
+#else
+	all = kmemdup(&ipv4_devconf, sizeof(ipv4_devconf), GFP_KERNEL);
+	if (!all)
+		goto err_alloc_all;
+
+	dflt = kmemdup(&ipv4_devconf_dflt, sizeof(ipv4_devconf_dflt), GFP_KERNEL);
+	if (!dflt)
+		goto err_alloc_dflt;
+#endif
 
 #ifdef CONFIG_SYSCTL
 		tbl = kmemdup(tbl, sizeof(ctl_forward_entry), GFP_KERNEL);
@@ -2292,7 +2302,10 @@ static __net_init int devinet_init_net(struct net *net)
 		tbl[0].extra1 = all;
 		tbl[0].extra2 = net;
 #endif
+
+#ifndef CONFIG_NET_NS_INHERIT_ORIGINAL
 	}
+#endif
 
 #ifdef CONFIG_SYSCTL
 	err = __devinet_sysctl_register(net, "all", all);
-- 
1.9.1

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